Biostratigraphy and Geochemistry of Frasnian-Famennian boundary in north-west kerman

Category Paleontology and Stratigraphy
Group GSI.IR
Location The 24 Symposium of Geosciences
Author Najibzadeh H.;Ameri Ekhtiyar Abadi,M.;Dastanpour M.;Vaziri M.R.
Holding Date 27 August 2007


  The biostratigraphical and geochemical studies samples collected from Hutk and Shamsabad indicate that about 45%extinction of brachiopods probably caused by the Frasnian-Famennian bioevents, which is slightly higher than the rate of Devonian-Carboniferous extinction elsewhere.The results of isotopic carbon and oxygen isotop analysis (d13c%0VPDB and d100%VPDB)show a sudden decrease at the proposed Frasnian-Famenian extinction boundary which is followed by positive values above this horizon.The negative excursion may indicate a biomass extinction due to either a meteorite impact or decay of organic matter.The isotopic variations are correlated to those faunal changes and their extinctions in the area.